| Journal: | Polimeros (Sao Carlos) |
| Database: | PERIÓDICA |
| System number: | 000313903 |
| ISSN: | 1678-5169 |
| Authors: | Hung, Daniel Liu Chun1 Ho, Tong-Ing2 Liaw, Der-Jang3 Liaw, Been-Yang |
| Institutions: | 1Centro Tecnológico da Marinha em Sao Paulo, Sao Paulo. Brasil 2National Taiwan University, Department of Chemistry, Taipei, Taiwan. China 3National Taiwan University, Department of Chemical Engineering, Taipei, Taiwan. China |
| Year: | 1999 |
| Season: | Oct-Dic |
| Volumen: | 9 |
| Number: | 4 |
| Pages: | 78-81 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | This paper presents the synthesis and characterization of polyimides, which contain a 4,4'-hexafluoroisopropylidene-bisphthalic anhydride (6FDA) unit in the backbone. These polyimides are a result of the use of the traditional method of "one step". The reactions occur between equimolar of a dianhydride and an aromatic diamine in presence of the solvent dimethylacetamide (DMAc), then cyclo-dehydrided by adding the acetic anhydride and pyridine. In this work, the 6FDA was used as the dianhydride and four different diamines were investigated: 3,3',5,5'-Tetramethyl-2,2- bis[4-( 4-aminophenoxy) phenyl] propane; 2,2-bis[4-(4-aminophenoxy)-phenyl] hexafluoropropane; 1,3-bis(4-aminophenoxy)benzene and 2,2'-dimethyl-4,4'-bis(4-aminophenoxy)biphenyl. The four polyimides (PA, PB, PC and PD) were characterized by tensile strength, infrared, inherent viscosity, Differential Scanning Calorimeter (DSC) to get the glassy transition temperature (Tg) and Gel Permeation Chromatograph (GPC) to obtain the average molecular weight (Mn) |
| Disciplines: | Química |
| Keyword: | Química de polímeros, Poliimidas, Síntesis, Dianhídrido, Diaminas, 6FDA |
| Keyword: | Chemistry, Polymer chemistry, Synthesis, Polyimides, Dianhydride, Diamines, 6FDA |
| Full text: | Texto completo (Ver HTML) |
